<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>500异常</title>
	    <!-- <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests"> -->
		<meta name="renderer" content="webkit">
		<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
		<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
		<style type="text/css">
			.alert {
			    position: relative;
			    padding: .75rem 1.25rem;
			    margin-bottom: 1rem;
			    border: 1px solid transparent;
			    border-radius: .25rem;
			    color: #721c24;
			    background-color: #f8d7da;
			    border-color: #f5c6cb;
		    }
    	</style>
	</head>
	<body>
		<div style="margin: 20px auto;max-width: 500px">
			<div class="alert">500服务器异常!</div>
		</div>
	</body>
</html>